LT5500EGN 데이터 시트보기 (PDF) - Linear Technology

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LT5500EGN

1.8GHz to 2.7GHz Receiver Front End

Linear Technology 

LT5500

1.8GHz to 2.7GHz

Receiver Front End

FEATURES

■ 1.8V to 5.25V Supply

■ Dual LNA Gain Setting: +13.5dB/–14dB at 2.5GHz

■ Double-Balanced Mixer

■ Internal LO Buffer

■ LNA Input Internally Matched

■ Low Supply Current: 23mA

■ Low Shutdown Current: 2µA

■ 24-Lead Narrow SSOP Package

U

APPLICATIO S

■ IEEE 802.11 and 802.11b DSSS and FHSS

■ High Speed Wireless LAN

■ Wireless Local Loop

DESCRIPTIO

The LT®5500 is a receiver front end IC designed for low

voltage operation. The chip contains a low noise amplifier

(LNA), a Mixer and an LO buffer. The IC is designed to

operate over a power supply voltage range from 1.8V to

5.25V.

The LNA can be set to either high gain or low gain mode.

At 2.5GHz, the high gain mode provides 13.5dB gain and

a noise figure (NF) of 4dB. The LNA in low gain mode

provides –14dB gain and an IIP3 of + 8dBm at 2.5GHz.

The mixer has 5dB of conversion gain and an IIP3 of

– 2.5dBm at 2.5GHz, with –10dBm LO input power.

, LTC and LT are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

TYPICAL APPLICATIO

RF

INPUT

ENABLE

100pF

GAIN

SELECT

100pF

2V

RF INPUT

FILTER

EN

LT5500

GS

L4

LNA_IN

LNA_OUT

GND

LNA_GND

C4

LO–

100pF

×2

L2

2V

1µF

1nF

IF OUTPUT

L7

LO+ C17 L3

VCC

100pF

×4

MIX_GND LO MIX_IN

L9

RF

IF

L5

IF+

IF–

T2

8:1 2V

••

100pF

5500 F01

LO INPUT

C23

INTERSTAGE

FILTER

Figure 1. 2.5GHz Receiver. Interstage Filter is Optional

LNA Gain (High Gain Mode)

and Mixer Conversion Gain

14.0 fRF = 2.5GHz

6.0

13.9 TA = 25°C

5.8

13.8

5.6

13.7

5.4

13.6

5.2

13.5

5.0

13.4

4.8

13.3

4.6

13.2

4.4

13.1

4.2

13.0

4.0

1.5 2 2.5 3 3.5 4 4.5 5 5.5

VCC (V)

5500 TA02

5500f

1

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